What is the ruling on seeking treatment from individuals who treat sciatica by requesting personal information, offering prescriptions that include eating a sheep's tail, prohibiting washing with soap, writing a paper, and cutting a specific herb, while repeating the phrase "I have cut the sciatic nerve and not cut the herb by its name," knowing that they claim healing is from Allah and are known for their gifted wisdom?

These matters you mentioned, some of them might be a cure, and some of them appear to be acts of sorcery and charlatanism. If that is the case, then it is not permissible to go to these people or seek treatment from them. Allah Almighty has made healing occur through one of two ways: either by taking recourse to a lawful (Shar'i) means, such as Ruqyah (definition) and the like, or by seeking treatment through known physical (Hissi) means. So, if something is neither a lawful (Shar'i) means nor a physical (Hissi) means, it is not permissible to believe it to be a means.

The means that Allah Almighty has made as means are of two types: 1. Lawful (Shar'i) means: such as the Noble Qur'an and supplication (Du'a). 2. Physical (Hissi) means: such as material medicines known through the Sharia (definition), like honey, or through experience.

If a matter is unlawful, then there is no obedience to a creature in it. And the mere fact that a person has performed Hajj or fulfilled some religious obligations does not necessarily mean that everything he does is correct and in accordance with the Sharia.